Chaser holding means



Jun 19, 1945. D. R POWELL Em 2,378,431

CHASER HOLDING MEANS Filed Aug. 19, 1945 IU/emZO S; .Dcu cd'R.P014 e([ William L .[Vbo we Patented June 1 9, 1945 UNITED STATES PATENT OFFICE CHASER HOLDING MEANS Q David R. Powell and William L. Moore, Cleveland,

Ohio, assignors to The National Acme Company, Cleveland, Ohio, a corporation of Ohio Application August 19, 1943, Serial No. 499,173

10 Claims. (Cl. 10l03) This invention relates to threading tools such as taps and dies and, more particularly, to an improved means for holding the chasers and chaser blocks in position in the die body, the principal object being the provision ofsuch hold ing'means which is simple in construction, inexpensive to manufacture and emcient in use.

Heretofore, the chasers and chaser blocks have been placed in position in the die body with no means for holding them in position otherthan 'thedie cap or housing and when it was desired to move this die cap out of'its holding position for the purpose of removing the 'chasers, or for any other reason, the chasers and blocks frequently would fall out of the die body and this often resulted in damage thereto.

Therefore, an object of the present invention is the provision of means for holding thechasers ,in place in the die body independent of the die cap or other operating parts in such manner that they may be readily removed and reinserted when desired Without the necessity of removing the holding means and which will not in any way interfere with the normal actionof the die.

In the drawing accompanying 'andforming a part of this specification,

Fig. 1 is apartial plan view of 'a die head, 11.. lustrating this improved holding means in position, and

Fig. 2 is an end View thereof, partlyin section.

Similar characters of reference indicate corresponding parts in the several views.

Before explainingin detail thepresent improvement and its mode of operation, "we desire it understood that the invention is not limited tothe detail of construction and arrangement of parts which are illustrated in the accompanying drawing since the invention is capable of other embodiments, and that the phraseology employed is for the purpose of description and not of limitation.

This invention is an improvement upon the dies and taps of The National Acme Company move the chasers and blocks from the die body. Heretofore, when the housing was shifted to this position, as hereinbefore pointed out, frequently thechasers would fall out of the die body.

The front face of the body 2 isprovided with a plurality of'chaser receiving slots or recesses 4 of T-shape for the reception of one-piece, stepped, correspondingly-shaped chaser blocks 5 to which may be secured in any suitable manner the chasers 6.

Each chaser block is provided with a rearwardly extending pin 1 projecting into a circularly formed slot 8 in the rear of each T-shaped slot of the die body. These slots are each provided with aspring 9 and a headed plunger l0 located in position to engage the rearwardly extending pin of the chaser blocks and are for the purpose of shifting the chaser blocks and chasers outwardly to hold the cam faces in engagement with the cams of the cap and'also to open the chas'ers when the cap is withdrawn.

Located to one side of each circular opening 3 l is a threaded opening I I for the reception of a headed screw [2, the head of which is intended slightly to overlap the opening 8 in order to maintain the spring 9 in the opening when the chasers are removed.

A spring clip l3, which may be of any suitable shape adapted to project or extend into the opening 8, is held in place by the screw I2 and slightly.

engages the pin 1 of the chaser block in such manner that it will yield'to permit insertion and removal of the chaser blocks when slight additional pressure is exerted onthem but will hold the blocks in the body when the cap or housing 3 does not engage them. In other words, this spring is a supplement-a1 holding means for holding the chasers in position on the release thereof by the die cup and is, in a sense, a latch-like holding means for such chasers.

Thus, it will be seen that the provision of this spring clip will act to prevent the chaser from falling out of the die body regardless of the position of the cap or housing and will not in any way interfere with the intended operation of the die and its parts. The clip is not inserted deeply enough into the opening 8 to interfere in any and using the same, although without attempting to set forth all of the forms in which it may be made or all of the modes of its use, we claim:

1. A threading tool having a body, removable chasers carried by said body, operating means for said tool adapted to hold said chasers within the body, resilient means for urging the chasers outwardly and means extending transversely of said resilient means for holding the chasers in said body independent of the operating means of said threading tool, said transversely extending means eiiective to permit removal of said chasers while maintained in normal position in the body.

2. A threading tool having a body, removable chasers carried by said body, operating means for said tool adapted to hold said chasers within the body, resilient means for urging the chasers outwardly; and resilient means extending transversely of said first resilient means for holding the chasers in said body independent of the operating means of said threading tool.

3. A threading tool having a body, a plurality of slots therein, chaser-carrying blocks removals-1y carried in said slots, means for hOldiIlg said blocks in the body, means for urging the chasers outwardly, and latch-like means carried by the body and having engagement with said blocks for holding the chasers in said threadin tool upon the release of said first holding means.

4. A threading tool having a body, a plurality of :slots therein, chaser carrying blocks removably carried in said slots, means for holding said'blocks in the body, means 'for urgingthe chasers outwardly, and latch-like means carried by the body and having engagement'with said blocks for holding the chasers in the body and in position to permit insertion and removal of said blocks without removal of said latch-like means, said last means comprising a sprin clip extending transversely of said outwardly urging means and operative on the release ofsaid first'holding means.

'5. A threading tool having a body, removable versely of said first resilient means carried by the body for holding the chasers therein independent of said shiftable means, said resilient means adapted to permit removal and insertion of the chasers without removal of said resilient means.

7. A threading tool having a body, removable chasers carried by said body, operating means for said tool adapted to hold said .chasers within the body, resilient means for urging the chasers outwardly, and resilient means extending transversely of said first resilient means and also carried by the body in the rear of the Chasers for holding the chasers therein independently of th operating means of said threading tool and effective to yield to'permittheinsertion of the chasers without manual operation of said second resilient means.

8. A threading itool having a body, a removable chaser carried by said body, a housing for normally holding the chaser in workin position and operative to release and permit the removal of the chaser, resilient means for shifting the chaser, and supplemental resilient means engaging a part of the chaser for holding it in position against dropping out on the release of the chaser by the housing and effective to yield and permit the insertion of the chaser without manual operation of said supplemental-means.

-9. A threading tool having abody, a removable chaser block carried by said body and having a pin, a chaser carried by said block, means for normally holding the "block and its chaser in working position and operative to release and permitthe removal of the block and its chaser, means for shifting the chaser, and supplemental resilient holding means engaging the pin of the V block for holding the block and its chaser in posichasers carried by said body, shiftable means 00- tion on the release thereof by said first means and effective also to yield and permit insertion of the-chaser-and its block'without manual operation-of' said supplemental means.

'10. A threadingtool havingra body, removable threading means carried by the body and having a pin, a'housing for-normally holding the thread.- ing meansin working position and operative to release and permit the removal of said threading means, resilient means for shifting the threadin means, and supplemental resilient means comprising a spring clip having a part thereof extending over said pin to "hold the threading .means in position against dropping out on'the re lease thereof bythe housing and effective to yield and permit the insertion of the threading means without manual operation of said spring clip.

DAVID R. POWELL. WILLIAM L. MOORE. 

